Production chronology1939–open
Sourced production or model lifecycle range used by the main catalog timeline.
The Riley 12/4 is catalogued as a passenger car from the United Kingdom-origin Riley marque. The catalog also contains sourced technical specifications for this model. This entry summarizes the Riley 12/4 nameplate from the catalog's observed regulatory and technical records.
Sourced production or model lifecycle range used by the main catalog timeline.
First-admission years observed in Dutch vehicle registrations; this is market evidence, not a worldwide production range.